#define _CRT_SECURE_NO_WARNINGS 1

class Solution {
public:
    int findPeakElement(vector<int>& nums) {
        int left = 0, right = nums.size() - 1;
        while (left < right)
        {
            int mid = left + (right - left + 1) / 2;
            if (nums[mid] < nums[mid - 1])
                right = mid - 1;
            else
                left = mid;
        }
        return left;
    }
};